Pet acute-toxicity — caffeine, ethanol (alcohol), avocado (Persin)
Source: "Some food toxic for pets" (PMC2984110), first-hand peer-reviewed review, Tavily server-side extract 2026-07-21. Companion to the chocolate/onion/grape/macadamia topics.
Caffeine (methylxanthine)
"Caffeine" is "caffeine (1,3,7-trimethylxanthine)". "Theobromine is also found in tea, cola beverages, and some other foods." "Theobromine in chocolate is 3–10 times that of caffeine." "Caffeine tablets ingested by dogs" — "tablets often contain 100 mg each".
Ethanol / alcohol
"Alcohol toxicoses": "Ethanol is the alcohol in alcoholic beverages, perfumes and mouthwashes." "Dogs cannot tolerate alcohol, even in small amounts."
Avocado (Persin)
"Avocado fruit, pits, leaves and the actual plant are all potentially poisonous to dogs." "Persin is a fungicidal toxin found in both the fruit and leaves of the avocado tree." "Persea americana" — "Feeding avocados to any non-human animal should be completely avoided."
Note: the review does not give a numeric lethal dose for avocado ("The lethal dose is not known"); caffeine/ethanol clinical mg/kg thresholds are also not provided in this source, so no fabricated doses.
Source: pdf-raw/pmc-pet-food-toxic-pmc2984110.txt — "Some food toxic for pets" (PMC2984110, https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2984110/).